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  4. When KMnO4 reacts with KBr in alkaline medium gives bromate ion. Then oxidation state of Mn changes from +7 to

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Q. When $KMnO_4$ reacts with $KBr$ in alkaline medium gives bromate ion. Then oxidation state of $Mn$ changes from $+7$ to

AIIMSAIIMS 2011Redox Reactions

Solution:

$2 \overset{+7}{M}nO^{-}_{4} +Br^{-} +H_{2}O \to 2 \overset{+4}{M}nO_{2}+BrO^{-}_{3}+2OH^{-}$